[Blindmath] Tactile embosser Resolution

[Ian Chris]

John,

Thanks for the explanation. it was indeed good and it clarified my
confusion. This shall help me get out of that craziness, of being unable to
comprehend the technical aspect. Although DPI in Printing and Embossing i
guess are different since in Ink printing halftones(read overlapping of one
dot on to another) is also to be considered.


Regards,
Ian

On Thu, Dec 18, 2014 at 9:49 PM, George Bell via Blindmath <
blindmath at nfbnet.org> wrote:
>
> Hi John,
>
> Dare I suggest a better term might be to refer to, "Resolution" as
> distinct from DPI (Dots Per Inch)?
>
> George.
>
> -----Original Message-----
> From: Blindmath [mailto:blindmath-bounces at nfbnet.org] On Behalf Of John
> Gardner via Blindmath
> Sent: 18 December 2014 15:58
> To: 'Ian Chris'; 'Blind Math list for those interested in mathematics'
> Subject: Re: [Blindmath] Tactile embosser Resolution
>
> Ian, this is just another example of how some manufacturers imply more
> than what actually occurs.
>
> The new ViewPlus Embraille embosser has a resolution of 300 dpi in the
> sense of this 50 dpi number you quote.  But we do not say that.  At least
> not without some explanation. 300 dpi is not a measure of how many dots can
> be embossed in a one inch line - it is the accuracy with which a dot can be
> placed on the paper.  50 dpi is actually a pretty crude value if one wants
> to produce braille with official NLS spacings.
>
> You could never emboss 50 dots in a one inch line.  Or rather, if you did
> emboss 50 dots per inch, you would just be embossing a big mess.  And it
> wouldn't help.  Anything more than 20 dpi is beyond the resolution of the
> static sensors in fingers.  Few people can distinguish 20 dpi line from a
> solid line when just placing a finger on it.  If you move that finger or
> use a fingernail, you can tell the difference, but it doesn't actually
> provide any more information.
>
> Hope this helps.
>
> -----Original Message-----
> From: Blindmath [mailto:blindmath-bounces at nfbnet.org] On Behalf Of Ian
> Chris via Blindmath
> Sent: Wednesday, December 17, 2014 10:54 PM
> To: Blind Math list for those interested in mathematics
> Subject: [Blindmath] Tactile embosser Resolution
>
> Dear List members,
>
> I was studying the tactile outputs of a braille embosser, it says that the
> resolution (for tactile embossing)  is 50 DPI, which in printing terms
> shall mean that there are 50 dots in a length of 2.4 MM. In other words
> there are 50 projections in a straight line if embossed in an inch that is
> equal to 25.4 mm.This shall mean that the dot size is 0.5 MM in diameter.
> All the above is just a theoretical assumption.
>
> If i have to fit in 50 dots in a row 0.5 mm with no spacing in between my
> assumption is that the dot diameter read the projection diameter or the
> surface area is equal to 0.5 mm. Now if if have to distinctly feel each dot
> there has to be a minimum separation between the two. I am confused if i
> can get the resolution of 50 DPI in the embossing.
>
>
> Experts may comment on the same as it is not leading to any understanding
> of the embossing possibilities for one of my samples. also this is not
> specific to a specific brand of embossers. The sample that i am working on
> is also one of its kind and has no significance whatsoever but this
> inability to understand is driving me crazy.
>
> Regards,
>
> Ian
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